Forwarding changes to directory servers and to other replication servers

Saving changes to stable storage, which includes trimming older operations

Each replication server contains a list of all the other replication servers in
the replication topology. Replication servers are also responsible for providing other servers with
information about the replication topology. Even the smallest deployment must include two
replication server instances, to ensure availability in case one of the replication server
instances fails. There is usually no need for additional replication server instances unless the
directory service must be able to survive more than one failure at
a time, or unless the number of directory server instances must be very
large.

Although replication servers do not store directory data, they are always LDAP servers
or JMX servers. Like directory servers, replication servers can be configured, monitored, backed
up and restored.